Hi. For the FSI validation case of cylinder with trailing flap, I made a comparison of displacements Ux Uy at point A obtained from
Calculixnode output file as well as
preCICEwatchpoint file. There seems to be a minor deviation between the data reported by
preCICE. Thus, I would like to know what can be the reason for this deviation, and how the displacement data is generated by
preCICEfor the watchpoint file. Is the methodology used to obtain interface displacement for coupling process identical to the one used for printing the watchpoint file?
This post is an update regarding the issue of deviation between
Calculix displacement and
preCICE watchpoint data that was posted by me on Gitter, which is also referenced above. On further investigation for other time intervals, the deviation was worse (see link ). The results in the above link were for a coupled simulation that was restarted from 3.7675[s].
Also, I attempted a coupled simulation starting from t = 0[s]. Unlike the previous attempt, there appears to be no deviation in the duration of interest, with the exception of phase shift identical to the original discussion I posted in Gitter (see link ).
Calculix data for restarted simulation as well as the original simulation is identical, it leads me to suspect that in regions of significant displacement, the
preCICE watchpoint report seems to be faulty for a restarted simulation. Also for any simulation, there is always a phase difference of 1 timestep (here dt = 0.0005[s]) between the Calculix and preCICE data.